I wonder if any of the four folks at Red Shift did a search or examination of similar products?
They show shots of previous suspension stems in their movie, and claim theirs is better because it’s designed for road bikes. I’m old enough to have tried, and broken, those previous designs. If you really think you need front suspension, you’re much better off with a suspension fork.
I remember seeing these in the 90s as a cheap way to get suspension on a mountain bike. Actually, I don’t think I ever saw anybody I know actually riding with one of these, but I used to see them in the magazines.
The only thing this does is cushion the bumps to the hands and arms, but the arms can absorb the shock relatively easy just by flexing.
Soft enough to absorb high frequency and you have a floppy handle bar. Firm enough that the bar is safe will make your elbows become a far better full feedback enabled shock system